But the exact impact is still unclear.
It's impossible to quantify the exact impact women have had on the city's jails.
Of course, it is hard to determine the exact impact these sites are having.
The exact impact on oil production, refining and the transport of crude and oil products was unclear today.
The exact impact of an American refusal to take part in United Nations peacekeeping operations was not immediately clear.
The lack of irrigation water has affected the yield, but the exact impact wont be known until the harvest is over".
The exact impact of the power-sector overhaul will be determined by specific guidelines and, in the case of desalination plants, by the utilization rate.
And the property industry – which hates Labor's changes – has modelling that says removing negative gearing could actually push house prices up and that the exact impact is hard to know.
Attributing the exact impact new laws may have had on a drop in assaults is a difficult and complex task, with saturated media coverage and an extensive public education campaign also playing their part.
Changing sea surface temperatures and the reducing area of the Arctic summer sea-ice could also be altering weather patterns, but scientists said more research was needed to determine the exact impact.
Such uncertainty is likely to hang over many mining deals in the country, including any fresh bid for Macarthur, until the exact impact of the tax becomes clear, analysts have said.
